K 10
svn:author
V 6
royger
K 8
svn:date
V 27
2014-08-04T09:01:21.163447Z
K 7
svn:log
V 769
xen: implement support for mapping IO APIC interrupts on Xen

Allow a privileged Xen guest (Dom0) to parse the MADT ACPI interrupt
overrides and register them with the interrupt subsystem.

Also add a Xen specific implementation for bus_config_intr that
registers interrupts on demand for all the vectors less than
FIRST_MSI_INT.

Sponsored by: Citrix Systems R&D

x86/xen/pvcpu_enum.c:
 - Use helper functions from x86/acpica/madt.c in order to parse
   interrupt overrides from the MADT.
 - Walk the MADT and register any interrupt override with the
   interrupt subsystem.

x86/xen/xen_nexus.c:
 - Add a custom bus_config_intr method for Xen that intercepts calls
   to configure unset interrupts and registers them on the fly (if the
   vector is < FIRST_MSI_INT).

END